<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body> 

<form action="/webproject01/TopicTest02" method="post">

<pre>
<input type="text" name="calculator">
<input type="submit" value="计算">
</pre>

</form>

</body>
</html>